Grinding machine



April 19, 1927. 11,625,049

6. A. OLIVER GRINDING MACHINE Filed NOV. 21 1925 2 Sheets-Sheetl a z a 2726 3 Z I I I glwuwtclm fie'aqge 2% filial/ er. I

April 19, 1927. A. 0LIVER GRINDING MACHINE Filed Nov, 21. 1925 2 Sheets-Sheet 2 At. A n

Patented Apr. 19, 1927.

GEORGE .A. OLIVER, F CLEBURNE, TEXAS.

GRINDING MACHINE.

Application filed November 21, 1925. Serial No. 70,479.

This invention relates to in'iprovements in grinding machines and has special reference to a machine for reclaiming pniversalcylinder packing ring segments.

The railroads have quite generally adopted for use in their locomotives what is known as the universal cylinder packing rings. These rings are made in two circular parts each part consisting of a plurality (usually six) of segmental portions. The two parts are grooved in their adjacent sides, for the reception of an internal spring ring which serves to hold them in place and. to set them against the interior walls of the c vlinders. When the engine is shopped for repairs or general overhauling, the worn rings are trued up so as to properly fit the bore of the cylinders and replaced.

. It has been found from experience that it is extremely di'fiicult to assemble the various segments of which the ring is composed into a full ring and to turn or grind them as a ring because the ends of the segments are worn so that if they are. placed end to end .the ring becomes distorted and of a smaller diameter than that required. If the segments are assembled so as to form a circular ring of the required diameter, a splice piece must be added; thus, for example, if the rings are made up of six segments each 'subtending an arc of sixty degrees, then when the splice piece is added there will be seven segments in each part, but thering will now have the proper diameter and will therefore fit as well as when the rings were new.

It has hitherto been customary to save all the removed segments of this type for packing rings and to ship them to a reclamation plant where they were matched up with reference to the semicircular groove. These grooves, however, become worn and distorted and all packing rings thus assen'lbled were imperfect and did not fit the cylinder there- My invention. briefly described, comprises a base upon WlllCll l have mounted a grinding wheel which is rotated about its axis by some suitable means Such as an electric motor, a steam turbine or by means of power transmitted to it by a belt. Mounted so as to swing about a pivot that intersects the axis of the grinder is a plate that can be oscillated about this pivot while moving in 55 a plane parallel with the axis about which the axis about which the grinding wheel turns, means is provided for moving the plate towards and away fI'Oll'l the grinder so as to obtain any desired distance between the its construction and the manner of using the same shall be clearly understood, I shall have reference to the accon'ipanying drawings in which one specific embodiment thereof has been illustrated and in which:

Fig. 1 is a top plan view of my improved machine;

Fig. 2 is a side elevation thereof;

Fig. 3 isa section taken on line 3-3 of Fig. 1;

Fig. 4 is a section taken on line 44,

Fig. 5 IS a section taken on line 5-5, Fig. 1; 7

Fig. 6 is a section similar to that shown in Fig. 5 but which illustrates a. modification;

Fig. 7 is a section taken on line 77;' Fig. 2;

Fig. 8 1s a view looking in the direction of arrow 8 m Fig. 1 and shows the manner plate 75 by permitting a waste of steam and causing a decreased efficiency.

When rings are assembled from old parts in which the adjusting bolt is locked in adusted position, and

Fig. 9 shows the manner .in which the in the usual manner, the segments with tapered ends have to be scrapped and as this is true of about one-half of the segments, a large loss results. .When the machine that forms the subject matter of this invention is employed, thesegments may have their ends ground off so as to remove any taper thereby making it possible to save all of the ring se ments however worn they may swinging table or radius plate can be extended to take care of large sized rings.

Numeral 1 represents machine. This base is supported onfour legs 2 which hold the. base at the desired height above the tloor 3. Sccuredi to the upper surface of the base 1 are two pillow blocks 4 and 5' within the bearings of which 110 the shaft 6 is journalled. This shat't may be rotated by any suitable means such as a the base of my steam turbine motor or belt but as an example I have shown an electric motor 7 directly coupled to the shaft at 8. A grinding wheel 9 is fastened to one end of the shaft. Theupper surface of the base 1 has a depression 10 directly underneath the grinding wheel so that wheels of varying diameters may be used. This depression has suflicient width in the direction of the shaft to permit the grinding wheel 9 to be readily removed and replaced. The end of the base adjacent the depression 10 has its upper surface at such a height that the plane of the upper surface 11 thereof inter- 5 sects the wheel 9 the desired distance below its axis. A T slot 12 is provided in the material beneath the surface 11. This slot. extends parallel with the axis of the shaft 6 and is symmetrical with respect to a vertical plane that passes through the axis of the shaft so that the head 13 of the T-bolt 14 can be movedonly in a direction parallel with the axis of the shaft 6. The head 13 of, the bolt 14 is elongated and one end thereof has a vertical T-slot 15 for the reception of the head 16 of the adjusting screw 17 which cooperates with a threaded opening in the nut 18 which is secured to the, end of the base by means of bolts 19. Secured to the end of the screw 17 is a handle 20 by means of which it can be rotated. It is evident that if it is .found desirable the screw 17 may have a threaded connection with the head 13 and be rotatably but n'onslidably connected with the part 18. In the construction illustrated the bolt 14 can be moved to any desired position along the slot 12. In order that the, bolt shall not be permitted to rotate accidentally, I have so constructed the nut 18 that the screw can be clamped against rotation. This is accomplished by providing the nut with a cut 21 which intersects the threaded openingand divides one end into two sections 22. and 23. A clamping bolt 24 has a threaded connection with the section 22 and is rotatable in the hole in section 23 so that when the bolt is rotated in one direction it tends to close the cut 21 and clamp screw 17 against rotation. The bolt 14 has a portion 25 thereof, directly above the head 13, cylindrical; this cylindrical portion extends above the surface 11 a distance slightly less than the thickness of the radius plate 26 where it terminates in a shoulder 25 whose width is equal to the difference between the diameter of the cylindrical part 25 and that of the threaded part14. The radius plate 26 is sector shaped (Fig.1) and has a hole 27 into which the cylindrical part 25 extends. The arcuate edge 28 of plate 26 is curved about the center of the hole 27. A washer 29 has a central opening 30 for the reception of the threaded part 14 and is provided on its lower side with a downwardly proa handle 34 being attached to the plate to. I

facilitate movement thereof. the bottom of the depression 10 is a support 35 which can be removed by ren'ioving the bolts 36 and which. serves'as a support for the end of the plate 26. The bolts 36 pass through elongated slots 37 in the support so that it may be adjusted towards and away from the wheel 9. Plate 26 has secured to it two'stud bolts 38 which are employed for clamping the ring segment 39 in place. The ring segments have a cross section substan- 'tially like that shown in Figs. 5 and 6 and have a'semicircular groove 40 on one side. I have shown two ways in which the rings 39 may be secured in place. In Fig. 5- I have shown a clamp 41 that has one end slotted forthe reception of the clamping bolt 38 and the other end curved so as to Secured to provide a hooked end 43 that engages in I the groove 40. A spacer 44 is applied to the bolt between theclamp'41 and the upper surface of the plate 26. In Fig. 6' I have shown a slightly different clamping means. In this clamping device the clamps 41 have been replaced by clamping, members 45 which have a straight portion provided with a longitudinal opening 47 One end of members 45 is bent at right angles, in the manner indicated by numeral 48. The end of part 48 rests upon the upper surface of the to be, ground, it 1s sometimes necessary toattach to plate 26 an arcuate extension-51 Fig. 9) which has elongated openings .52

for the reception of the clamping bolts 38' and is provided with bolts 53 that corm spend in function with bolts 38 and cooperate with the clamp 54 in holding the member. to be ground, in place. The operation of my machine is as follows: Let us suppose that it is desired to true a number of segmental ring sections 39' of a given radius which we will designate as R. The plate26is adjusted by means of the screw 17 until the distance between the face of the grinding wheelland the center of the bolt 14 is equal to the radius desired.

rename Screw 24 is now tightened so as to prevent accidental rotation. One of the ring segments 39 is now laid upon the plate 26 and adjusted so as to be concentric with the pivot 14 and then clamped against moveand even made in the form of an attac ment to an ordinary lathe.

By addin the extension plate 51 (Fig 9) it is possib e to much greater radii than cylinder rings.

grind arcuate member's of Having now described my invention, what I claim as new is:

A grinding machine for grinding arcuate segments to a predetermined radius of curvature comprising, in combination, a base member having a plurality of bearings, a shaft mounted for rotation in said bearings, a grinding wheel secured to said shaft, said wheel having a plane grinding surface, a plate supported by said base and mounted for oscillation in a plane perpendicular to the plane of the grinding surface of the wheel, a pivot about which said plate oscillates, means for moving said pivot towards and away from the grinding Wheel, means for supporting the outer end of said plate and an arcuate extension plate secured to the movable end of said first mentioned plate.

, In testimony whereof I atlix my signature.

enoaen A.- onrvnn. 

